From 4083d9299b0798d93e887a18f649d8df0f0d8f95 Mon Sep 17 00:00:00 2001
From: Ingvar Stepanyan <me@rreverser.com>
Date: Wed, 20 Aug 2014 23:20:50 +0300
Subject: [PATCH] Fixes #492 Conflicts: 	src/services/services.ts

---
 src/services/services.ts | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/services/services.ts b/src/services/services.ts
index 862ca387e86..4e7323e1b55 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1411,10 +1411,7 @@ module ts {
             return {
                 getSourceFile: (filename, languageVersion) => {
                     var sourceFile = getSourceFile(filename);
-
-                    Debug.assert(!!sourceFile, "sourceFile can not be undefined");
-
-                    return sourceFile;
+                    return sourceFile ? sourceFile.getSourceFile() : null;
                 },
                 getCancellationToken: () => cancellationToken,
                 getCanonicalFileName: (filename) => useCaseSensitivefilenames ? filename : filename.toLowerCase(),